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Chemical Composition of Silk and Its Influence on Yellowing Mechanism

Research Project

Project/Area Number 06660069
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 蚕糸・昆虫利用学
Research InstitutionHeian Jogakuin College

Principal Investigator

ITO Hiraku  Heian Jogakuin College, Associate Professor, 生活学科, 助教授 (20213077)

Co-Investigator(Kenkyū-buntansha) MORI Hajime  Kyoto Institute of Technology, Researcher, 繊維学部, 助手 (80201812)
MURAOKA Yoichiro  Professor (Kagoshima University), 教授 (10074147)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1994: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsSilk / Silk Cocoon / Yellowing / Chemical Composition / Artificial Diet / Protein Component
Research Abstract

We investigated the yellowing behavior and chemical compositions of cocoon filaments produced by the silkworms reared on an artificial diet, and compared with those on a mulberry leaf diet. To this end, silkworms were reared on an artificial diet (A) or on a mulberry leaf diet (M) for an entire instar. The artificial diet consisted of a Tofu-cake as its main component. Two types of cocoons (A and M) were used as sample materials. Yellowing of M-sample was remarkable after irradiation with ultraviolet light. On the other hand, it was scarcely observed for A-samples. The Amino Acid Composition and the X-ray diffraction pattern of the A fibroin was found to be almost the same as those of M fibroin. The amount of the A sericin dissolved in hot water (28%) was higher than that of M (24%), and the dissolution rate of the A sericin was higher than that of M.Hot-water-soluble fraction from A-sample contains relatively a large amount of nucleotide compounds, such as deoxycytidylic acid (dCMP) and cytidylic acid (CMP). On the other hand, M-smple contains little nucleotide compounds. This difference may cause the differences in yellowing behavior between these two samples. The artificial diet used in this study affects yellowing behavior of cocoon filaments and chemical compositions of hot-water-soluble fractions (sericin) ; on the other hand, it does not affect those of fibroin proteins.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] Ito, Muraoka, Mori et al.: "Structure and Chemical Composition of silk Proteins in Relation to the silkworm Diet" Textile Research Journal. 65. 755-759 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ito, Muraoka et al.: "Effect of Dyes on the Tensile Properties of Colored Poly(Ethylene Terephthalate) Film" Textile Research Journal. 66(in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mori et al.,: "Effect of Mutations on the Intracellular Localization of Bombyx mori Cytoplasmic Polybedrosis Virus Polyhedrin" Journal of Genetic Virology. (in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Mori et al.: "A High Molecular Weight Protein Isolated from Chicken Gizzard: Its Localization at the Dense Plaques and Dense Bodies of Smooth Muscle" Journal of Cell Science. 108(in press). (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 1)H.Ito, Y.Muraoka, H.Mori: "Structure and chemical composition of silk proteins in relation to the silkworm diet" Textile Res. J.65. 755-759 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Ito, Y.Muraoka, et al.: "Effect of Dyes on the Tensile Properties of Colored Poly (ethylene Terephthalate) Film" Textile Res. J.(in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Mori, et al.: "Effect of mutations on the intracellular localization of Bombyx mori eytoplasmic polyhedrosis virus polyhedrin" J.Genetic Virol.(in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Mori et al.: "A high molecular weight protein isolated from chicken gizzard : its localization at the dense plaques and dense bodies of smooth muscle" J.Cell Science. 108 (in press). (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] H.Mori et al.: "Cloning and expression of the gene of hemocytin, an insect humorallectin which is homologous with the mammalian von Willebrand factor" Biochimica et Biophysica Acta. 1260. 245-258 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ito,Muraoka,Mori: "Structure and chemical composition of silk proteins in relation to silkworm diet" Textile Research Journal. 65. 755-759 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ito,Muraoka,Umehara: "Shrink-resistant properties and surface characteristics of wool fibers treated with multifunctional epoxides." Textile Research Journal. 64. 440-444 (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] Ito,Muraoka,Mori: "Structure and chemical composition of silk proteins in relation to silkworm diet" Textile Research Journal. 65(in press). (1995)

    • Related Report
      1994 Annual Research Report
  • [Publications] Ito,Muraoka,Umehara: "Strink-resistant properties and surface characteristics of wool fibers treated with multifunctional epoxides." Textile Research Journal. 64. 440-444 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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